Pop-up fastener



FIG. 1 is a front elevational view of a pop-up fastener showing our new design;

FIG. 2 is a rear elevational view thereof;

FIG. 3 is a top view thereof;

FIG. 4 is a right side elevational view thereof;

FIG. 5 is a left side elevational view thereof;

FIG. 6 is a bottom view thereof;

FIG. 7 is a perspective view thereof; and,

FIG. 8 is a cross-sectional view thereof. 

The ornamental design for a pop-up fastener, as shown and described. 